Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation

The mechanical loading frequency affects the functional properties of shape memory alloys (SMA). Thus, it is crucial to study its effect for the successful use of these materials in dynamic applications. Based on the superelastic cyclic behavior, this work presents an experimental methodology for th...

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Autores principales:	Emmanuel Ferreira de Souza, Paulo César Sales da Silva, Estephanie Nobre Dantas Grassi, Carlos José de Araújo, Antonio Gilson Barbosa de Lima
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	shape memory alloys superelasticity Ni-Ti Belleville spring self-heating frequency dynamic loading Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/995794ddc81442e8a111aa6e1f89b478
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spelling	oai:doaj.org-article:995794ddc81442e8a111aa6e1f89b4782021-11-11T19:08:16ZCritical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation10.3390/s212171401424-8220https://doaj.org/article/995794ddc81442e8a111aa6e1f89b4782021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7140https://doaj.org/toc/1424-8220The mechanical loading frequency affects the functional properties of shape memory alloys (SMA). Thus, it is crucial to study its effect for the successful use of these materials in dynamic applications. Based on the superelastic cyclic behavior, this work presents an experimental methodology for the determination of the critical frequency of the self-heating of a NiTi Belleville conical spring. For this, cyclic compressive tests were carried out using a universal testing machine with loading frequencies ranging from 0.5 Hz to 10 Hz. The temperature variation during the cyclic tests was monitored using a micro thermocouple glued to the NiTi Belleville spring. Numerical simulations of the spring under quasi-static loadings were performed to assist the analysis. From the experimental methodology applied to the Belleville spring, a self-heating frequency of 1.7 Hz was identified. The self-heating is caused by the latent heat accumulation generated by successive cycles of stress-induced phase transformation in the material. At 2.0 Hz, an increase of 1.2 °C in the average temperature of the SMA device was verified between 1st and 128th superelastic cycles. At 10 Hz, the average temperature increase reached 7.9 °C and caused a 10% increase in the stiffness and 25% decrease in the viscous damping factor. Finally, predicted results of the force as a function of the loading frequency were obtained.Emmanuel Ferreira de SouzaPaulo César Sales da SilvaEstephanie Nobre Dantas GrassiCarlos José de AraújoAntonio Gilson Barbosa de LimaMDPI AGarticleshape memory alloyssuperelasticityNi-Ti Belleville springself-heating frequencydynamic loadingChemical technologyTP1-1185ENSensors, Vol 21, Iss 7140, p 7140 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	shape memory alloys superelasticity Ni-Ti Belleville spring self-heating frequency dynamic loading Chemical technology TP1-1185
spellingShingle	shape memory alloys superelasticity Ni-Ti Belleville spring self-heating frequency dynamic loading Chemical technology TP1-1185 Emmanuel Ferreira de Souza Paulo César Sales da Silva Estephanie Nobre Dantas Grassi Carlos José de Araújo Antonio Gilson Barbosa de Lima Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation
description	The mechanical loading frequency affects the functional properties of shape memory alloys (SMA). Thus, it is crucial to study its effect for the successful use of these materials in dynamic applications. Based on the superelastic cyclic behavior, this work presents an experimental methodology for the determination of the critical frequency of the self-heating of a NiTi Belleville conical spring. For this, cyclic compressive tests were carried out using a universal testing machine with loading frequencies ranging from 0.5 Hz to 10 Hz. The temperature variation during the cyclic tests was monitored using a micro thermocouple glued to the NiTi Belleville spring. Numerical simulations of the spring under quasi-static loadings were performed to assist the analysis. From the experimental methodology applied to the Belleville spring, a self-heating frequency of 1.7 Hz was identified. The self-heating is caused by the latent heat accumulation generated by successive cycles of stress-induced phase transformation in the material. At 2.0 Hz, an increase of 1.2 °C in the average temperature of the SMA device was verified between 1st and 128th superelastic cycles. At 10 Hz, the average temperature increase reached 7.9 °C and caused a 10% increase in the stiffness and 25% decrease in the viscous damping factor. Finally, predicted results of the force as a function of the loading frequency were obtained.
format	article
author	Emmanuel Ferreira de Souza Paulo César Sales da Silva Estephanie Nobre Dantas Grassi Carlos José de Araújo Antonio Gilson Barbosa de Lima
author_facet	Emmanuel Ferreira de Souza Paulo César Sales da Silva Estephanie Nobre Dantas Grassi Carlos José de Araújo Antonio Gilson Barbosa de Lima
author_sort	Emmanuel Ferreira de Souza
title	Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation
title_short	Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation
title_full	Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation
title_fullStr	Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation
title_full_unstemmed	Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation
title_sort	critical frequency of self-heating in a superelastic ni-ti belleville spring: experimental characterization and numerical simulation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/995794ddc81442e8a111aa6e1f89b478
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Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation

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